Safety device for staying-machines or the like.



C. F. ROOT. SAFETY nv|c FOR STAYING MACHINES OR THE LIKE.

APPLICATION FILED AUG-l2, I916.

- Patented Dec. 3, 1918.

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cmnoor. SAFETY DEVICE FOR STAYING MACHINES OR THE LIKE.

APPLICATION FILED AUGJZ; I9I6. v V

Patented Dec. 3, 1918.

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awe/whom ccmnoor. SAFETY DEVICE FOR STAYING MACHINES OR THE LIKE- I APPLICATION FILED AUG. [2, I916. Ififififlg Patented'bec. 3, 1918.

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citizen of the United States, and residentof Ravenna, in the county of Portageand Stete ofh1o, have invented certain new and use ful Improvements in Safety Devices for Staying-Machines or theflilre, of Which-the parts of the pitman. A spring and gravit y following isaspecification: I I p In my prior Patent, No; 1513146111 01? March 9, 1915; there is disclosed a safety device for use onpunching machines, box

staying machines, and similar machines, involvlng the useof a rec1pr0cat1ng" Work-per forming element thepurpose of thesafety] device being to render the actuatingmeans inoperative if the Work-performing element contacts during its operativestrokewiththe operators fingers, or anyiother obstruction extraneous to the Work. Thesafety meshe nism disclosed in the aforesaid patent is illustrated in a punching machine and is incorporated in a pitman or link interposed between the actuating eccentric and the punch and comprlses a pair of gags carried by pivoted arms which are automatically shifted just before the punch reaches the work to move the gags to their operative position between twonormally telescopic is depended upon to" restore-the arms and the gags carried thereby totheir inoperative position after the punch operates upon the WOI'lC, but if for any reason these a means 5 shouldfail tooperate, the gags would not be restored to their inoperative positi onian'd safety device. It is the object which, inthe event of failure; of the above; mentioned non positively actmgwmeene to them back to inoperative position.

The inventionisillustretedjin the a ccom Figure 1 is a front elevation of ortion or a box-stayingmachinednvolvmg the use ofe safety device constructed as above de scribed;

of the present inventibn to provide means for positively; restoringfthe gags to their inoperative position} and this} is preferably effected by meansof aflcanr i return j the gag-arms to inoperative position, i

will positively act upon saldarmsene shift Specification of resentment. Pwmnt gdimpmggiflwtm rit is st sideelev'stftion" settle-con true;

tion sh'ownfin Fig.1;f y p Fig. s1 a front elevation offthelsefety J5: limit or pitrnan with certain of the parts Fig! 4 is a" vertictilsection tttitfii 1 line 4-4 ofFig. 5; and y 1 yy F'g. 5 isjan enlarged. side elevation ofthe safety for actuating the gag-arms. i

The above-mentioned sztjfetyj link or pit man comprises a part 1 telescopically receiv ing theshankepf the otherpart 2 in a: Sdge 3 provided for" said shank". The shstnki 42 has a longitudinal slot 5 inits" upper pottiOn, throughj which it transverse pin 5" passes; Thi pin 5 by engag ment with the end wallfi formed by the? slot5,1imitsthe downwatrd movement of the part 2; The

upward movement of the shank eisrestrict edbythe lengthofthe slot 5. y

i The shaftA of the machine; when is cert ventionally illustrated in the drawings; has

an eccentric 1B which, connecting with the movement of the link, and in order to pre vent the up and down lnovent ent of the link from throwing or moving" the part 2 11 5 Wardly relative to the part 1 seats 7 are provided on the shanke which receivetherew in balls 9; thelatter projecting and having link or pitman and" the mechanism w it head of the part 1*, efiects a ,reci'proeetory movement in iJI'itIlSVGlSB a ertures s providedin part 2. Plungers 10 also are dis? posed in the apertures 8 and slide therein; being normally tensioned hy j springs 11* which are carried bypart' 1 and-"which exert same in their seats. 3 i it 1 A pair of opposed curved ermsgl and are pivoted, by means of pins lfi end 26 re spectivelyhto the part 2 in such manner that gag blocked? and-18{cztrried= by the uppee endsof the arms 11 and 14* respectively, Will we i normally move outwardly and oeeupyi lttte Lugs :19 and 20 respectivelm depen from erms 13 and 14 andareconnected h erect ng inoperative or openposition shown in-Fig me i placed on the anvil N.

engage the head of part 2 so as to limit the outward movement of said arms.

A pair of arms 22 and 23 are pivoted upon part 1 by screws or the like, 24 and 25, respectively and have interengaging male and female parts 26 and 27, in order to effect simultaneous movement of said arms 22 and 23, the latter having lateral stop members 28 and 29, respectively which engage with intermediate portions of the arms 13 and 14: as depicted in the drawings. The arm 23 is provided with an extension 30 which is adapted to contact with the lever 31 pivoted to the machine. A head H carrying the die or other tool P, is fastened to the part 2 of the link in any suitable manner, as by means of a pintle 40 on the rear face of the head H. which engages an eye 11 in the lower end of part 2 of the link.

, In operation, the lever 31, which is arranged to project into the path of travelof the extension 30 of the arm 23, contactswith said extension just prior to the instant that the punch P engages with the work that is The extension 30, upon contacting with the lever 31, will be rocked upwardly and thereby cause the stops 28 and 29 of arms 22 and 23 to move'in- Wardly toward each other, thus causing said stops to actuate the arms 13 and 1 1 so as to move the gag-blocks 17 and 18 borne by the arms 13 and 1e, inwardly toward each other so as to interpose the blocks 17 and 18 between the end 32 of part 1 and the shoulder 33' of the part 2, with the result that the downward movement of the part 1 will be communicated to the part 2 and thereby to head H and die P through the intermediary of the interposed blocks 17 and 18. Should, however, any obstruction occur between the anvil and punch, such as the finger or hand of the operator, the punch will contact with such obstruction before the extension 30 can reach or touch arm 31, consequently, the slight tension which the springs 11 exert on the balls 9 will be overcome, and the part 1 Will continue its downward movement inde pendently of the part 2, this being due to the fact that the extension 30 has not engaged the lever 31 to shift the arms 13 and 14: from the position shown in Fig. 1, in which position the blocks 17 and 18 are not interposed between parts 1 and 2, and which interposition of said blocks is necessary if part 2 is to partake of the working stroke of the part 1.

After the punch operates upon the work, thespring 21 restores the arms 13 and 14 andthe gag-blocks 17 and 18 to their inoperative position.

- The construction so far described is substantially the same as that shown in my aforesaid patent. It will now be noted that if the arms 13 and 14 are not restored to their inoperative position, either by gravity, or by the action of the spring 21 as in case of breakage of the latter, the parts of the link could not telescope upon meeting an obstruction on the succeeding down stroke of the punch, and hence the safety feature of the device would be destroyed. This objection is overcome by providing means in addition to the spring 21 for positively acting upon the arms 13 and 14 to re turn them to inoperative position. This means preferably comprises a cam (11 which is pivoted at 37 to the bracket 38 which carries the lever 31. The ln-acket 38 is in turn connected to second bracket 39 whicl': is vertically adj nstable on the machine to vary the time at which the levcr acts upon the projection 30 during the down stroke of the work-performing element. A spring d2 con-- necting the extremity of the lever 31 with the lower end of the bracket 39 yieldingly retains the lever 31 in the position. shown in the drawing, but permits it to be rocked about its pivotal connection 18 when the projection 30 contacts therewith.

The cam a, as best shown in Fig. 1, has two lateral edge portions 7) and c which are bent approximately at right angles to the plane of the cam. The bent edge portion 7) is continued upwardly to form an arm Z) and the bent edge portion c'is continued upwardly to form an arm 0. The arms 7) and c are substantially parallel and normally lie between two pins d and 6 carried. by the arms 13 and 11- respectively. The lower edge portions 6 and c are inclined toward each other. The arms 2') and 0 prevent inward movement of the arms 13 and 14 until the projection 30 contacts with the lever 31, at which time the pins d and 0 will be adjacent the inclined portions Z) and c, and hence will be free to move inwardly. The cam, therefore, does not interfere with the automatic throwing in of the gag-blocks, as above described. On the Lip-stroke of the link, if the spring 21 fails to restore the arms 13 and 11 to their inoperative position, the inclined cam-like portions 1) and a will act upon the pins d and e to move them outwardly, and hence shift the arms 13 and 14 to the inoperative position. The arms I) and c extend upwardly a sufficient distance to hold the arms 13 and 11 in their outward position during the remaining part of the up-stroke of the link or pitman.

The pivotal mounting of the cam at 37 permits the cam to rock slightly to accommodate itself to the constantly changing inclination of the pitman.

The cam a is adjustable in a vertical direction with the lever 31, as they are both carried by the bracket 38 which is in turn carried by the vertically adjustable bracket 39.

Obviously the exact mounting of the cam and the specific shape thereof are immaterial to the invention, as the invention con-.

templates any means in combination with a safety device of the type shown for positively restoring the gag-armsto their inoperative position.

What I claim is j i 1. In a machine of the kind described, the

combination with the Work-performing element and its actuating means, of a pair of telescopic parts interposed between the same, a pair of gag-arms pivoted to one of said parts having gag-blocks adapted to be interposed between said telescopic parts to render them rigid and non-yieldable, auto-l matic means to shift said arms totheir op erative position just prior to the engagement of the work by the work-performing element to render said parts non-yieldable, and aoam carried by a stationary part of the machine and being positioned and operative to automatically act upon both of said arms to positively restore them to their inoperative position.

2. In a machine of the kind described, the

combination with the work-performingelement and its actuating means, of a pair of telescopic parts interposed between the same, a pair of gag-arms pivoted to onegof said parts having gag-blocks adapted to be interposed between said telescopic parts to I render them rigid and non-yieldable, automatic means to shift said arms to their operative position just prior to the engagement of the Work by the work performing element to render said parts non-yieldable, and a cam pivotally associated with a stationary part of the machine and adapted to automatically act upon both of said arms to positively restore them to their inoperative position.

3. In a machine of thekind described, the

ment and its actuating means, of a pair of combination with the work-performing ele telescopic parts interposed between the same, a pair of gag-arms pivoted to one of said parts having gag-blocks adaptedto be interposed between saidtelescopic parts to render them rigid and non-yieldable, automatic means to shift said arms totheir op erative position just prior to the engagement of the work bythe work-performing element to render said parts non-yieldable, a projection associated with each of said arms, and acamfpivotally associated with a stationary part c and adapted to simultaneously act upon both their inoperative position.

i i 4. In a machine of the kind described, the

combination with the work-performing element and its actuating means, of a pair of a telescopic parts interposedbetween the same,

supported by said bracket positioned and operative for automatically restoring both said arms to their inoperative position.

the machine between said projections of said projections to restore said arms to Signed at Mansfield, in the county ot Roland and State of Ohio, this 8 day of August, A. D. 1916.

CHARLES r. noor.

Witness 1:

JOHN H. Goes.

Uopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0." 

